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                                <h1 id="&#x51FD;&#x6570;">&#x51FD;&#x6570;</h1>
<h3 id="&#x9ED8;&#x8BA4;&#x503C;&#x4EE5;&#x524D;&#x505A;&#x6CD5;">&#x9ED8;&#x8BA4;&#x503C;&#x4EE5;&#x524D;&#x505A;&#x6CD5;</h3>
<pre><code class="lang-js">&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">show</span>(<span class="hljs-params">a, b</span>) </span>{
        b = b || <span class="hljs-string">&apos;default b&apos;</span>;
        <span class="hljs-built_in">console</span>.log(a, b);
    }
    <span class="hljs-comment">//show(&apos;welcome&apos;, &apos;daliu&apos;);</span>
    show(<span class="hljs-string">&apos;welcome&apos;</span>);
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<h3 id="&#x9ED8;&#x8BA4;&#x503C;&#x73B0;&#x5728;&#x505A;&#x6CD5;">&#x9ED8;&#x8BA4;&#x503C;&#x73B0;&#x5728;&#x505A;&#x6CD5;</h3>
<pre><code class="lang-js">&lt;script type=&quot;text/javascript&quot;&gt;
    function show(a=&apos;&#x6B22;&#x8FCE;&apos;, b=&apos;&#x540C;&#x5B66;&apos;) {
        console.log(a,b);
    }
    show(&apos;welcome&apos;);
&lt;/script&gt;

&lt;script type=&quot;text/javascript&quot;&gt;
    function show({x=0, y=0}) {
        console.log(x, y);
    }
    //show({x:1, y:2}); //&#x89E3;&#x6784;
    show({x:1}); //&#x89E3;&#x6784;, y&#x4E0D;&#x4F20;,&#x4F7F;&#x7528;&#x9ED8;&#x8BA4;&#x503C;0
&lt;/script&gt;
</code></pre>
<h3 id="reset-&#x8FD0;&#x7B97;&#x7B26;">reset &#x8FD0;&#x7B97;&#x7B26;</h3>
<pre><code class="lang-js">&lt;script type=&quot;text/javascript&quot;&gt;
    //reset&#x8FD0;&#x7B97;&#x7B26;...
    let arr = [&apos;apple&apos;, &apos;banana&apos;, &apos;orange&apos;];
    console.log(arr); //[&apos;apple&apos;, &apos;banana&apos;, &apos;orange&apos;]
    console.log(...arr); //apple banana orange
&lt;/script&gt;
</code></pre>
<pre><code class="lang-js">&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-comment">//function show(a,b,c,d,e) {}</span>
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">show</span>(<span class="hljs-params">...a</span>) </span>{
        <span class="hljs-built_in">console</span>.log(a); <span class="hljs-comment">//[&apos;&#x96F6;&apos;, &apos;&#x4E00;&apos;, &apos;&#x4E8C;&apos;, &apos;&#x4E09;&apos;, &apos;&#x56DB;&apos;]</span>
        <span class="hljs-built_in">console</span>.log(a.length); <span class="hljs-comment">//5</span>
        <span class="hljs-built_in">console</span>.log(a[<span class="hljs-number">1</span>]); <span class="hljs-comment">//&#x4E00;</span>

        <span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">arguments</span>);
        <span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">arguments</span>[<span class="hljs-number">1</span>]);<span class="hljs-comment">//&#x4E00;</span>
        <span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">arguments</span>.length); <span class="hljs-comment">//5</span>
    }
    show(<span class="hljs-string">&apos;&#x96F6;&apos;</span>,<span class="hljs-string">&apos;&#x4E00;&apos;</span>,<span class="hljs-string">&apos;&#x4E8C;&apos;</span>,<span class="hljs-string">&apos;&#x4E09;&apos;</span>,<span class="hljs-string">&apos;&#x56DB;&apos;</span>);
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<pre><code class="lang-js">&lt;!-- <span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">script</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;</span><span class="javascript">
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">show</span>(<span class="hljs-params"></span>) </span>{
        <span class="hljs-keyword">return</span> <span class="hljs-built_in">Array</span>.prototype.slice.call(<span class="hljs-built_in">arguments</span>).sort();
    }
    <span class="hljs-built_in">console</span>.log(show(<span class="hljs-number">2</span>, <span class="hljs-number">5</span>, <span class="hljs-number">1</span>, <span class="hljs-number">3</span>, <span class="hljs-number">8</span>)); <span class="hljs-comment">//[1, 2, 3, 5, 8]</span>
</span><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span> --&gt;
<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">script</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;</span><span class="actionscript">
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">show</span><span class="hljs-params">(<span class="hljs-rest_arg">...a</span>)</span> </span>{
        <span class="hljs-keyword">return</span> a.sort();
    }
    console.log(show(<span class="hljs-number">2</span>, <span class="hljs-number">5</span>, <span class="hljs-number">1</span>, <span class="hljs-number">3</span>, <span class="hljs-number">8</span>)); <span class="hljs-comment">//[1, 2, 3, 5, 8]</span>
</span><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<pre><code class="lang-js">&lt;script type=&quot;text/javascript&quot;&gt;
    /**
    function show([a,b,c]) {
        console.log(a,b,c); //&#x89E3;&#x6784;, OK
    }
    show([1, 8, 3]);
    */
    function show(a, b, c) {
        console.log(a,b,c);
    }
    show(...[1, 8, 3]); //reset&#x8FD0;&#x7B97;&#x7B26;
&lt;/script&gt;
</code></pre>
<pre><code class="lang-js">&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">show</span>(<span class="hljs-params">a, b, ...c</span>) </span>{
        <span class="hljs-built_in">console</span>.log(a, b); <span class="hljs-comment">//1 2</span>
        <span class="hljs-built_in">console</span>.log(c); <span class="hljs-comment">//[3, 4, 5]</span>
    }
    show(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">4</span>, <span class="hljs-number">5</span>);
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<pre><code class="lang-js">&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-keyword">let</span> arr = [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>];
    <span class="hljs-keyword">let</span> arr2 = <span class="hljs-built_in">Array</span>.from(arr); <span class="hljs-comment">//&#x590D;&#x5236;&#x6570;&#x7EC4;</span>
    <span class="hljs-keyword">let</span> arr3 = [...arr]; <span class="hljs-comment">//&#x590D;&#x5236;&#x6570;&#x7EC4;</span>
    <span class="hljs-built_in">console</span>.log(arr, arr2, arr3);
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<h3 id="&#x7BAD;&#x5934;&#x51FD;&#x6570;">&#x7BAD;&#x5934;&#x51FD;&#x6570;</h3>
<pre><code class="lang-js">&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">show</span>(<span class="hljs-params"></span>) </span>{
        <span class="hljs-keyword">return</span> <span class="hljs-number">1</span>;
    }
    <span class="hljs-keyword">let</span> show2 = () =&gt; <span class="hljs-number">1</span>;
    <span class="hljs-built_in">console</span>.log(show2);
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<pre><code class="lang-js">&lt;script type=&quot;text/javascript&quot;&gt;
    let show = (a, b) =&gt; a + b;
    console.log(show(1, 2)); //3
&lt;/script&gt;
</code></pre>
<pre><code class="lang-js">&lt;script type=&quot;text/javascript&quot;&gt;
    let show = (a=1, b=2) =&gt; {
        console.log(a, b);
        return a + b;
    }
    console.log(show()); //4
&lt;/script&gt;
</code></pre>
<h3 id="&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E2D;&#x7684;this">&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E2D;&#x7684;this</h3>
<pre><code class="lang-js"><span class="hljs-comment">// &#x4E0D;&#x4F7F;&#x7528;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4EE3;&#x8868;&#x5B9A;&#x4E49;&#x51FD;&#x6570;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;</span>
&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-comment">//var id = 10; //&#x7528;var&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;&#x5168;&#x5C40;&#x53D8;&#x91CF;,&#x5C5E;&#x4E8E;window, &#x4F46;&#x662F;let,const&#x4E0D;&#x540C;</span>
    <span class="hljs-keyword">let</span> json = {
        id:<span class="hljs-number">1</span>,
        show: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
            setTimeout(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
                alert(<span class="hljs-keyword">this</span>.id);    <span class="hljs-comment">//undefined</span>
                <span class="hljs-comment">//setTimeout&#x662F;&#x7531;window&#x6267;&#x884C;&#x7684;</span>
                <span class="hljs-comment">//2&#x79D2;&#x540E;&#x8FD9;&#x91CC;&#x7684;this&#x6307;&#x7684;&#x662F;window</span>
            }, <span class="hljs-number">2000</span>);
        }
    };

    json.show();
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>

<span class="hljs-comment">// &#x4F7F;&#x7528;&#x7BAD;&#x5934;&#x51FD;&#x6570;</span>
&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-keyword">let</span> json = {
        id:<span class="hljs-number">1</span>,
        show: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
            setTimeout(() =&gt; {
                alert(<span class="hljs-keyword">this</span>.id); <span class="hljs-comment">//1</span>
                <span class="hljs-comment">//&#x6CE8;: &#x4F7F;&#x7528;&#x7BAD;&#x5934;&#x4E4B;&#x540E;, &#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E2D;&#x7684;this&#x662F;&#x6307;&#x5B9A;&#x4E49;&#x51FD;&#x6570;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;, &#x4E0D;&#x518D;&#x662F;&#x8FD0;&#x884C;&#x65F6;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;</span>
                <span class="hljs-comment">//&#x5BF9;&#x4E8E;&#x672C;&#x4F8B;&#x6765;&#x8BB2;, this&#x6307;&#x5B9A;&#x4E49;&#x51FD;&#x6570;show&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;, &#x5373;json</span>
            }, <span class="hljs-number">2000</span>);
        }
    };

    json.show();
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<h3 id="&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E2D;&#x6CA1;&#x6709;arguments">&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E2D;&#x6CA1;&#x6709;arguments</h3>
<pre><code class="lang-js">&lt;script type=<span class="hljs-string">&quot;text/javascript&quot;</span>&gt;
    <span class="hljs-keyword">let</span> show = (...args) =&gt; {
        <span class="hljs-comment">//console.log(arguments);    //error</span>
        <span class="hljs-built_in">console</span>.log(args); <span class="hljs-comment">//ok</span>
    }
    show(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>);
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>
<h3 id="&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E0D;&#x53EF;&#x505A;&#x4E3A;&#x6784;&#x9020;&#x51FD;&#x6570;">&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E0D;&#x53EF;&#x505A;&#x4E3A;&#x6784;&#x9020;&#x51FD;&#x6570;</h3>
<pre><code class="lang-js">// &#x4E0D;&#x4F7F;&#x7528;&#x7BAD;&#x5934;&#x51FD;&#x6570;
&lt;script type=&quot;text/javascript&quot;&gt;
    function show() {
        this.name = &apos;abc&apos;;
    }

    let s = new show(); //show()&#x5F53;&#x6784;&#x9020;&#x51FD;&#x6570;
    alert(s.name); //abc
&lt;/script&gt;

// &#x4F7F;&#x7528;&#x7BAD;&#x5934;&#x51FD;&#x6570;
&lt;script type=&quot;text/javascript&quot;&gt;
    function show = () =&gt; {
        this.name = &apos;abc&apos;;
    }

    let s = new show(); //error
&lt;/script&gt;
</code></pre>
<h3 id="&#x6807;&#x7B7E;&#x51FD;&#x6570;">&#x6807;&#x7B7E;&#x51FD;&#x6570;</h3>
<pre><code class="lang-js">&lt;script&gt;
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">fn</span>(<span class="hljs-params">args</span>) </span>{
        <span class="hljs-keyword">return</span> args[<span class="hljs-number">0</span>].toUpperCase(); <span class="hljs-comment">//WELCOME</span>
    }

    <span class="hljs-built_in">console</span>.log(fn<span class="hljs-string">`welcome`</span>);
<span class="xml"><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span></span>
</code></pre>

                                
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